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Phrase(s): Don’t waste your time. You will not get anywhere with it, so don’t waste time trying. • Mary: Should I ask Tom if he wants to go to the convention, or is he still in a bad mood? Sally: Don’t waste your time. Mary: Bad mood, huh? • Jane: I’m having trouble fixing this doorknob. Mary: Don’t waste your time. I’ve ordered a new one.
McGrawhill's American Idioms And Phrasal Verbs